In grassland ecosystem, the pyramid of biomass is

Options

A. Linear
B. Upright
C. Inverted
D. Spindle shaped

Explanation

### Step-by-Step Solution:

1. **Understanding the Pyramid of Biomass**:
- The pyramid of biomass represents the total mass of living matter at each trophic level in an ecosystem. It is a graphical representation that shows the relationship between different trophic levels.

2. **Identifying Trophic Levels in a Grassland Ecosystem**:
- In a grassland ecosystem, the primary producers are grasses. They form the base of the pyramid and have the highest biomass.
- The next level consists of primary consumers, which are herbivores such as rabbits and rats that feed on the grasses.
- Above the primary consumers are the secondary consumers, which include carnivores like snakes and lizards that feed on the herbivores.

3. **Analyzing the Biomass Distribution**:
- Since grasses (producers) have the highest biomass, the first trophic level (grasses) will have the largest bar in the pyramid.
- As you move up the trophic levels (to herbivores and then to carnivores), the biomass decreases. This is because energy is lost at each trophic level due to metabolic processes, resulting in less biomass at higher levels.

4. **Conclusion**:
- Given the distribution of biomass in a grassland ecosystem, the pyramid of biomass is upright, as it starts with a broad base (grasses) and narrows as it goes up to the top consumers (carnivores).

### Final Answer:
The pyramid of biomass in a grassland ecosystem is **upright**.

---